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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef _ASMANDES_UACCESS_H
#define _ASMANDES_UACCESS_H

/*
 * User space memory access functions
 */
#include <linux/sched.h>
#include <asm/errno.h>
#include <asm/memory.h>
#include <asm/types.h>

#define __asmeq(x, y)  ".ifnc " x "," y " ; .err ; .endif\n\t"

/*
 * The exception table consists of pairs of addresses: the first is the
 * address of an instruction that is allowed to fault, and the second is
 * the address at which the program should continue.  No registers are
 * modified, so it is entirely up to the continuation code to figure out
 * what to do.
 *
 * All the routines below use bits of fixup code that are out of line
 * with the main instruction path.  This means when everything is well,
 * we don't even have to jump over them.  Further, they do not intrude
 * on our cache or tlb entries.
 */

struct exception_table_entry {
    unsigned long insn, fixup;
};

extern int fixup_exception(struct pt_regs *regs);

#define KERNEL_DS     ((mm_segment_t) { ~0UL })
#define USER_DS        ((mm_segment_t) {TASK_SIZE - 1})

#define get_fs()    (current_thread_info()->addr_limit)
#define user_addr_max    get_fs

static inline void set_fs(mm_segment_t fs)
{
    current_thread_info()->addr_limit = fs;
}

#define uaccess_kernel()    (get_fs() == KERNEL_DS)

#define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs() -size))

#define access_ok(addr, size)    \
    __range_ok((unsigned long)addr, (unsigned long)size)
/*
 * Single-value transfer routines.  They automatically use the right
 * size if we just have the right pointer type.  Note that the functions
 * which read from user space (*get_*) need to take care not to leak
 * kernel data even if the calling code is buggy and fails to check
 * the return value.  This means zeroing out the destination variable
 * or buffer on error.  Normally this is done out of line by the
 * fixup code, but there are a few places where it intrudes on the
 * main code path.  When we only write to user space, there is no
 * problem.
 *
 * The "__xxx" versions of the user access functions do not verify the
 * address space - it must have been done previously with a separate
 * "access_ok()" call.
 *
 * The "xxx_error" versions set the third argument to EFAULT if an
 * error occurs, and leave it unchanged on success.  Note that these
 * versions are void (ie, don't return a value as such).
 */

#define get_user    __get_user                    \

#define __get_user(x, ptr)                        \
({                                    \
    long __gu_err = 0;                        \
    __get_user_check((x), (ptr), __gu_err);                \
    __gu_err;                            \
})

#define __get_user_error(x, ptr, err)                    \
({                                    \
    __get_user_check((x), (ptr), (err));                \
    (void)0;                            \
})

#define __get_user_check(x, ptr, err)                    \
({                                    \
    const __typeof__(*(ptr)) __user *__p = (ptr);            \
    might_fault();                            \
    if (access_ok(__p, sizeof(*__p))) {        \
        __get_user_err((x), __p, (err));            \
    } else {                            \
        (x) = 0; (err) = -EFAULT;                \
    }                                \
})

#define __get_user_err(x, ptr, err)                    \
do {                                    \
    unsigned long __gu_val;                        \
    __chk_user_ptr(ptr);                        \
    switch (sizeof(*(ptr))) {                    \
    case 1:                                \
        __get_user_asm("lbi", __gu_val, (ptr), (err));        \
        break;                            \
    case 2:                                \
        __get_user_asm("lhi", __gu_val, (ptr), (err));        \
        break;                            \
    case 4:                                \
        __get_user_asm("lwi", __gu_val, (ptr), (err));        \
        break;                            \
    case 8:                                \
        __get_user_asm_dword(__gu_val, (ptr), (err));        \
        break;                            \
    default:                            \
        BUILD_BUG();                         \
        break;                            \
    }                                \
    (x) = (__force __typeof__(*(ptr)))__gu_val;            \
} while (0)

#define __get_user_asm(inst, x, addr, err)                \
    __asm__ __volatile__ (                        \
        "1:    "inst"    %1,[%2]\n"                \
        "2:\n"                            \
        "    .section .fixup,\"ax\"\n"            \
        "    .align    2\n"                    \
        "3:    move %0, %3\n"                    \
        "    move %1, #0\n"                    \
        "    b    2b\n"                    \
        "    .previous\n"                    \
        "    .section __ex_table,\"a\"\n"            \
        "    .align    3\n"                    \
        "    .long    1b, 3b\n"                \
        "    .previous"                    \
        : "+r" (err), "=&r" (x)                    \
        : "r" (addr), "i" (-EFAULT)                \
        : "cc")

#ifdef __NDS32_EB__
#define __gu_reg_oper0 "%H1"
#define __gu_reg_oper1 "%L1"
#else
#define __gu_reg_oper0 "%L1"
#define __gu_reg_oper1 "%H1"
#endif

#define __get_user_asm_dword(x, addr, err)                 \
    __asm__ __volatile__ (                        \
        "\n1:\tlwi " __gu_reg_oper0 ",[%2]\n"            \
        "\n2:\tlwi " __gu_reg_oper1 ",[%2+4]\n"            \
        "3:\n"                            \
        "    .section .fixup,\"ax\"\n"            \
        "    .align    2\n"                    \
        "4:    move    %0, %3\n"                \
        "    b    3b\n"                    \
        "    .previous\n"                    \
        "    .section __ex_table,\"a\"\n"            \
        "    .align    3\n"                    \
        "    .long    1b, 4b\n"                \
        "    .long    2b, 4b\n"                \
        "    .previous"                    \
        : "+r"(err), "=&r"(x)                    \
        : "r"(addr), "i"(-EFAULT)                \
        : "cc")

#define put_user    __put_user                    \

#define __put_user(x, ptr)                        \
({                                    \
    long __pu_err = 0;                        \
    __put_user_err((x), (ptr), __pu_err);                \
    __pu_err;                            \
})

#define __put_user_error(x, ptr, err)                    \
({                                    \
    __put_user_err((x), (ptr), (err));                \
    (void)0;                            \
})

#define __put_user_check(x, ptr, err)                    \
({                                    \
    __typeof__(*(ptr)) __user *__p = (ptr);                \
    might_fault();                            \
    if (access_ok(__p, sizeof(*__p))) {        \
        __put_user_err((x), __p, (err));            \
    } else    {                            \
        (err) = -EFAULT;                    \
    }                                \
})

#define __put_user_err(x, ptr, err)                    \
do {                                    \
    __typeof__(*(ptr)) __pu_val = (x);                \
    __chk_user_ptr(ptr);                        \
    switch (sizeof(*(ptr))) {                    \
    case 1:                                \
        __put_user_asm("sbi", __pu_val, (ptr), (err));        \
        break;                            \
    case 2:                             \
        __put_user_asm("shi", __pu_val, (ptr), (err));        \
        break;                            \
    case 4:                             \
        __put_user_asm("swi", __pu_val, (ptr), (err));        \
        break;                            \
    case 8:                                \
        __put_user_asm_dword(__pu_val, (ptr), (err));        \
        break;                            \
    default:                            \
        BUILD_BUG();                         \
        break;                            \
    }                                \
} while (0)

#define __put_user_asm(inst, x, addr, err)                \
    __asm__ __volatile__ (                        \
        "1:    "inst"    %1,[%2]\n"                \
        "2:\n"                            \
        "    .section .fixup,\"ax\"\n"            \
        "    .align    2\n"                    \
        "3:    move    %0, %3\n"                \
        "    b    2b\n"                    \
        "    .previous\n"                    \
        "    .section __ex_table,\"a\"\n"            \
        "    .align    3\n"                    \
        "    .long    1b, 3b\n"                \
        "    .previous"                    \
        : "+r" (err)                        \
        : "r" (x), "r" (addr), "i" (-EFAULT)            \
        : "cc")

#ifdef __NDS32_EB__
#define __pu_reg_oper0 "%H2"
#define __pu_reg_oper1 "%L2"
#else
#define __pu_reg_oper0 "%L2"
#define __pu_reg_oper1 "%H2"
#endif

#define __put_user_asm_dword(x, addr, err)                 \
    __asm__ __volatile__ (                        \
        "\n1:\tswi " __pu_reg_oper0 ",[%1]\n"            \
        "\n2:\tswi " __pu_reg_oper1 ",[%1+4]\n"            \
        "3:\n"                            \
        "    .section .fixup,\"ax\"\n"            \
        "    .align    2\n"                    \
        "4:    move    %0, %3\n"                \
        "    b    3b\n"                    \
        "    .previous\n"                    \
        "    .section __ex_table,\"a\"\n"            \
        "    .align    3\n"                    \
        "    .long    1b, 4b\n"                \
        "    .long    2b, 4b\n"                \
        "    .previous"                    \
        : "+r"(err)                        \
        : "r"(addr), "r"(x), "i"(-EFAULT)            \
        : "cc")

extern unsigned long __arch_clear_user(void __user * addr, unsigned long n);
extern long strncpy_from_user(char *dest, const char __user * src, long count);
extern __must_check long strnlen_user(const char __user * str, long n);
extern unsigned long __arch_copy_from_user(void *to, const void __user * from,
                                           unsigned long n);
extern unsigned long __arch_copy_to_user(void __user * to, const void *from,
                                         unsigned long n);

#define raw_copy_from_user __arch_copy_from_user
#define raw_copy_to_user __arch_copy_to_user

#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
static inline unsigned long clear_user(void __user * to, unsigned long n)
{
    if (access_ok(to, n))
        n = __arch_clear_user(to, n);
    return n;
}

static inline unsigned long __clear_user(void __user * to, unsigned long n)
{
    return __arch_clear_user(to, n);
}

#endif /* _ASMNDS32_UACCESS_H */

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